In the cold winter months, do this one thing when entering office buildings or shopping malls: Use the rotating door. A rotating door is designed to let people get in and out of a building without heat escaping. When you open a regular door, a vacuum effect takes place and sucks cold air from outside inside. You’ve probably witnessed the effect at busy buildings. By simply choosing the rotating door, you help save energy and keep the cold air outside.
ANDREWS MCMEEL SYNDICATION